The sentence uses the present continuous tense ("are + verb-ing") to describe an action happening at the moment. Therefore, "looking" is the correct form of the verb.
Can I help you? I think you are ___ for someone.
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Question context
This question is part of 🗣️ Verbal Ability within the broader 🧠 Aptitude Mastery subject and appears in the Education Testing Council by HEC preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.